date_range Débute le 24 août 2015
event_note Se termine le 28 septembre 2015
list 5 séquences
assignment Niveau : Introductif
chat_bubble_outline Langue : Anglais
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Les infos clés

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timer 15 heures de cours

En résumé

Learn about acoustics by using the concept of impedance. Following part 1, radiation, scattering, and diffraction are studied. Wave propagation in closed space is also covered. Leads to understand essentials as well to cover graduate level topics.

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Le programme

Week 1. Radiation – Breathing & Trembling Sphere Problem

What happens if we have a certain discontinuity that is a function of three spatial variables (e.g. x,y,z for Cartesian coordinate)?

- What are the radiation characteristics of a breathing sphere, which is assumed to vibrate omni-directionally with equal magnitude?

What is the difference between a breathing sphere and a trembling sphere, which vibrates in a certain direction with a uniform velocity?

Week 2. Radiation – Baffled Piston & Finite Vibrating Plate Problem

How can we generate sound? By the fluctuation of fluid particles or the vibration of structures? How are they related?

How can we understand the radiation of a finite vibrating plate? Can we assume this plate as numerous vibrating pistons?

 Week 3. Scattering & Diffraction / Kirchhoff-Helmholtz Equation

How can we express the wave propagation when it is reflected due to the presence of discontinuities in space?

How can we explain the circumstances under which we can hear sound but cannot see the sound source?

What is the relation between the wavelength and the diffraction?

Week 4. Wave Propagation in Space / Reverberation Period and its Design Application

If there are different types of impedance distribution in space, how can we explain the propagation characteristics?

How can we acoustically define ‘large’ or ‘small’ space’? Is it related to the frequency?

Is there any measure that can represent the characteristics of the space?

Week 5. Wave Propagation in Space / Duct Acoustics

How can we express the sound field that is neither fully diffuse field nor only a direct field?

When the size of the space is small relative to wavelength, what happens to the propagation of sound?

When the length of one direction is significantly greater than the cross-sectional direction of the space, how does the wave propagate with respect to its wavelength?

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Les intervenants

  • Yang-Hann Kim - Mechanical Engineering
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Le concepteur

The Korea Advanced Institute of Science and Technology (KAIST) was established in 1971 by the Korean government as the nation’s first research-intensive graduate school for science, engineering and technology. It has now grown into one of the world’s best universities, delivering top notch education and research programs for undergraduate and graduate students. KAIST encourages interdisciplinary and convergent research across a wide spectrum of disciplines, as well as strong collaborations with industry and global institutions.
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Ce qui la différencie le plus des autres plateformes MOOC, c'est qu'elle travaille qu'avec les meilleures universités et organisations mondiales et diffuse leurs contenus sur le web.

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